It isn't always the most straightforward thing in the world, deciding who you want to invite to your wedding and who you don't. Well it sometimes is. If there's someone who the happy couple definitely want to have there, like the father of the bride, then he obviously gets an invitation and job done. Easy. It's not always so clear though. There are of course friends who you want to have there, but there are others, where you're not so sure. So you have to assess the probability that they'll say yes. If a friend lives in Brasil anyway and almost certainly won't come, then you can happily invite him even if you don't especially want him to come. If his "yes" has, for example, just a 5% probability and you're only 50% sure you want to have him there, thaen there's only a 2.5% chance that he'll show up and you won't want to see him. You can take a small risk of this nature.If however the friend lives say in the same street and so will almost certainly (say 90%) come, then you have to be pretty damn sure that you want him there. Even if you have a 70% wanting-him-to-be-there, then there's still a (0.3*0.9)*100= 27% chance that he'll be standing around at the wedding unwanted. And that's a pretty big risk.Of course, you don't want to extrapolate this theory too far and only invite people who you either 100% want to have there or who will 100% certainty not come. But it's not a bad little formula to guide you in the borderline cases.

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